Muscles of mastication (madible)

Question 1

Mandible Movement

Answer 1

depends on tempro-mandibular joint
ligaments:
*temporomandibular ligament
*sphenomandibublar ligament
*stylomandibular ligament

Question 2

Lower Mandible

Digastric Muscle

Answer 2

also raise larynx
origin - inside surface of lower border of mandible, mastoid process of temporal bone
insertion - intermediate tendon, attached to corpus of hyoid
action - raise larynx/ lower madible

Question 3

Lower Mandible

Mylohyoid Muscle

Answer 3

origin - mylohoid line, unpaired

action - lift mandible

Question 4

Lower Mandible

Geniohyoid Muscle

Answer 4

superior to mylohyoid
origin - lower midline border of mandible
insertion - anterior hyoid
action - lower mandible

Question 5

Lower Mandible

External Pterygoid Muscle

Answer 5

origin - lateral pterygoid plate and greater wing of sphenoid bone
insertion - condoyle of mandible
action - extends jaw and lowers madible

Question 6

Lift Mandible

Masseter Muscle

Answer 6

origin - zygomatic arch
insertion - down and back into ramus of mandible
action - lift mandible

Question 7

Lift Mandible

Temporalis Muscle

Answer 7

origin - squamous portion of temporal bone
insertion - under zygomatic arch to anterior border of ramus of mandible
action - lift mandible

Question 8

Lift Mandible

Internal Pterygoid Muscle

Answer 8

origin - lateral ptergoid plate and perpendicular plate of palatine bone
insertion - down, lateral, and posterior to inner surface of mandible ramus
action - lift mandible